509-FOD - Allen Bradley Magnetic Starter

509-FOD - Allen Bradley Magnetic Starter

When you're dealing with large motors, you don’t have time to worry about whether your starter can keep up. The Allen-Bradley 509-FOD is built for those situations—simple, dependable, and made to handle serious electrical loads without fuss.

This is a NEMA Size 5 direct online (DOL) motor starter, so it does exactly what most industrial setups need: start the motor quickly and reliably, without unnecessary complexity. What makes it more than just a basic starter is the built-in Class 30 overload protection, which helps protect your motor from overheating during longer or heavier-duty runs. It’s the kind of feature that quietly saves you from bigger problems down the line.

In terms of capacity, this unit is designed for demanding environments. With a 270A continuous current rating and the ability to handle high inrush currents, it’s well-suited for larger motors—like the ones you’d find in processing equipment, HVAC systems, or heavy material handling. It’s not oversized for the job—it’s sized right for it.

Installation is straightforward. You’ve got screw-type connections, rail mounting capability, and a factory-installed auxiliary contact, so you’re not piecing things together just to get it running. Once it’s in place, it stays out of the way and does its job.

Key Features and Benefits

• Direct online (DOL) starter for simple, reliable motor control
• Class 30 overload protection to help prevent motor damage
• Handles high current loads and demanding startup conditions
• External reset option for quicker recovery after trips
• Includes 1 normally open auxiliary contact (expandable)
• Screw terminal connections for secure, familiar installation
• Built for long service life with minimal maintenance
• Designed to support emergency stop applications

Technical Specifications

• Catalog Number: 509-FOD
• NEMA Size: Size 5
• Starter Type: Direct Online (DOL)
• Control Voltage: 110V (50 Hz) / 120V (60 Hz) AC
• Continuous Current: 270 A
• Service Limit Current: 312 A
• Max Horsepower: 75 HP @ 230V (3-phase)
• Inrush Current Peak: 3163 A
• Overload Relay: Eutectic alloy, temperature compensated
• Release Class: Class 30
• Auxiliary Contacts: 1 NO (up to 8 max)
• Connection Type: Screw terminals (power & control)
• Wire Size Range: 4 AWG to 500 MCM
• Mounting: Rail mountable
• Enclosure Type: Open
• Operating Temperature: Up to 65°C

Material Compliance and Certifications

• The 509-FOD uses silver alloy power contacts and silver auxiliary contacts, which helps with conductivity and reduces wear over time. The internal metal components are treated to resist corrosion, so it holds up well in typical industrial environments. It’s built to meet NEMA standards and follows IEC 60947-4-3 (Class 2 coordination) guidelines.

Where It Works Best

• This starter is a good fit anywhere you’re running larger motors that need consistent, no-nonsense control, including:
• Manufacturing equipment
• HVAC systems and compressors
• Conveyor systems
• Water and wastewater operations
• General industrial motor control panels